Axial blower



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United States Patent O 3,189,260 AXEAL BLOWER Sergei Konstantinovich Ivanov, Donetsk, U.S.S.R., assignor to Donetsky Gosudarstvenny Proektno-Konstruktoi-sky i Eksperirnentalay institute Kompieksnoi Melthanizatsii Shakht-Dongiprougiemash Filed Mar. 8, 1963, Ser. No. 264,742 2 Ciains. (Cl. 230-120) This invent-ion relates to axial blowers and, more precisely, to a design of `such blowers ensuring extension of the stable operation range.

Hitherto, for achievement of stable operation of aXial blowers the application of ferrules was known, those ferrules being installed in the blower case in front of the rotor.

Utilization of such ferrules, however, does not ensure, to the required degree, localization of parasitic ow of air in the peripheral portion of the rotor blades, adversely aifecting stable operation of the blower.

The fundamental aim of this invention is in designing a blower, which is exempt from the abovesaid drawback.

In the proposed design the forward (inlet) sides of the blower rotor blades are arranged and operate in a transition piece narrowing in the direction of the air ow. The transition part connects the blower case with a cylindrical mouth, forming together with the ferrule installed in front of the rotor an annular slit intended for by-pass of air.

Owing to the extension of the stable-operation range attained thanks to the application of the blowers proposed design there will be achieved also an extension of its economical-operation zone and an increase in reliability both when operating on suction and on forcing.

The afore-mentioned and other features of this invention will be evident from the description cited below, the drawings enclosed thereto, and the claims. In these drawings FIG, 1 schematically illustrates a general View f the proposed blower, and FIG. Z--aerodynamic characteristic curves of the blower of this invention and of a common type blower.

The proposed blower is arranged as follows: Transition part 1 (FIG. 1) tapering in the direction of the air flow and forming a part of the blower case is connected with cylindrical mouth 2 in which ferrule 3 is concentrically mounted. The latter is arranged in front of blades 4, of the blower rotor 5, and its diameter is equal to the diameter of the cylindrical portion 6 of the blower casing. Mouth 2, which diameter is equal, approximately, to twice the diameter of the rotor, forms together with ferrule 3 an annular slit a intended for by-pass of air. Guide vanes 7 are installed in ferrule 3. Transition part 1 is installed in such a way that just the forward (inlet) portions of blades 4 are arranged in it, while the rear portions of the blades 4 are located in the blower case cylindrical portion 6.

The following symbols are used in FIG. 2:

Her-static pressure, in kg./m.2;

cr-static pressure, in dimensionless values; Q-delivery, in m.3/min.;

delivery, in dimensionless values; ncr-eciency As may be seen from the characteristic curves presented in FIG. 2, the static pressure in the curve recess in op- ICC eration of an ordinary blower is 50% below the maximum pressure created by the proposed blower. Thus operation of the proposed blower is exempt from any recess on the pressure characteristic curve.

The eiciency o7 of the proposed blower as compared with that of an ordinary one will not be reduced, while the economical-operation zone will be enlarged.

Moreover, the proposed axial blower operates in a stable manner within the whole range of the pressure characteristic curve from maximum and down to zero.

In the above description the design is presented as an example of one of the most demonstrative forms of the proposed blower design; however, it must be quite obvious for any person competent in the given iield that there may be different alterations and variations introduced without, however, departing from the very essence and the scope of the invention, as well as from the scope of the following claims.

What I claim is:

1. An axial ow blower comprising a circular elongated hollow casing, said casing having a cylindrical air inlet portion terminating in an inwardly tapering transition portion which in turn terminates in a cylindrical discharge portion, a ring ferrule disposed solely in said inlet portion in spaced relation to the casing of said inlet portion to provide an annular air passage between said ferrule and said casing, the outside diameter of sa-id ferrule being substantially equal to the inside diameter of said discharge portion, radially disposed guide varies: fixed within said ferrule, a rotor rotatably mounted in said discharge portion and radially disposed blades onsaid rotor, a portion of each blade being disposed within said transition portion and the remainder of each blade being disposed in said discharge portion.

2. An axial flow blower comprising a circular elongated hollow casing, said casing having a cylindrical air inlet portion terminating in an inwardly tapering transition portion which in turn terminates in a cylindrical discharge portion, a ring ferrule disposed solely in said inlet portion in spaced relation to the casing of said inlet portion to provide an annular air passage between said ferrule and said casing, radially disposed guide Vanes xed within said ferrule, a rotor rotatably mounted` in said discharge portion and radially disposed blades on said rotor, a portion of each blade being disposed within said transition portion and the remainder of each blade being disposed in said discharge portion.

References Cited by the Examiner UNITED STATES PATENTS 2,219,937 10/40 Pollomarel 230-120 2,339,602 1/44 Hagen 230-122 2,391,512 12/45 POnOmareE 230--120 2,540,968 2/51 Thomas 230-120 2,628,768 2/53 Kantrowitz 230--120 2,720,356 10/55 Erwin 230-133 2,847,941 8/58 Jackson 103-89 FOREIGN PATENTS 377,132 6/23 Germany. 564,336 9/ 44 Great Britain.

KARL I. ALBRECHT, Primary Examiner.

I OSEPH H. BRANSON, JR., Examiner. 

1. AN AXIAL FLOW BLOWER COMPRISING A CIRCULAR ELONGATED HOLLOW CASING, SAID CASING HAVING A CYLINDRICAL AIR INLET PORTION TERMINING IN AN INWARDLY PAPERING TRANSITION PORTION WHICH IN TURN TERMINATES IN A CYLINDRICAL DISCHARGE PORTION, A RING FERRULE DISPOSED SOLELY IN SAID INLET PORTION IN SPACED RELATION TO THE CASING OF SAID INLET PORTION TO PROVIDE AN ANNULAR AIR PASSAGE BETWEEN SAID FURRULE AND SAID CASING, THE OUTSIDE DIAMETER OF SAID FURRULE BEING SUBSTANTIALLY EQUAL TO THE INSIDE DIAMETER OF SAID DISCHARGE PORTION, RADIALLY DISPOSED GUIDE VANES FIXED WITHIN SAID FERRULE, A STATOR ROTATABLY MOUNTED IN SAID DISCHARGE PORTION AND RADIALLY DISPOSED BLADES ON SAID ROTOR, A PORTION OF EACH BLADE BEING DISPOSED WITHIN SAID TRANSITION PORTION AND THE REMAINDER OF EACH BLADE BEING DISPOSED IN SAID DISCHARGE PORTION. 